fw: Use ndn-cxx's RttEstimator in AsfStrategy
Refs: #4887
Change-Id: Ice718be99f2b96f183bb35c5df84930be54a9f8e
diff --git a/daemon/fw/asf-measurements.cpp b/daemon/fw/asf-measurements.cpp
index 404fc85..cf3a317 100644
--- a/daemon/fw/asf-measurements.cpp
+++ b/daemon/fw/asf-measurements.cpp
@@ -32,8 +32,8 @@
NFD_LOG_INIT(AsfMeasurements);
-const RttStats::Rtt RttStats::RTT_TIMEOUT(-1.0);
-const RttStats::Rtt RttStats::RTT_NO_MEASUREMENT(0.0);
+const time::nanoseconds RttStats::RTT_TIMEOUT(-1);
+const time::nanoseconds RttStats::RTT_NO_MEASUREMENT(0);
const double RttStats::ALPHA = 0.125;
RttStats::RttStats()
@@ -43,23 +43,11 @@
}
void
-RttStats::addRttMeasurement(RttEstimator::Duration& durationRtt)
+RttStats::addRttMeasurement(time::nanoseconds durationRtt)
{
- m_rtt = static_cast<RttStats::Rtt>(durationRtt.count());
-
- m_rttEstimator.addMeasurement(durationRtt);
-
- m_srtt = computeSrtt(m_srtt, m_rtt);
-}
-
-RttStats::Rtt
-RttStats::computeSrtt(Rtt previousSrtt, Rtt currentRtt)
-{
- if (previousSrtt == RTT_NO_MEASUREMENT) {
- return currentRtt;
- }
-
- return Rtt(ALPHA * currentRtt + (1 - ALPHA) * previousSrtt);
+ m_rtt = durationRtt;
+ m_rttEstimator.addMeasurement(durationRtt, 1);
+ m_srtt = m_rttEstimator.getSmoothedRtt();
}
////////////////////////////////////////////////////////////////////////////////
@@ -122,14 +110,9 @@
return;
}
- time::steady_clock::Duration steadyRtt = time::steady_clock::now() - outRecord->getLastRenewed();
- auto durationRtt = time::duration_cast<RttEstimator::Duration>(steadyRtt);
-
- m_rttStats.addRttMeasurement(durationRtt);
-
+ m_rttStats.addRttMeasurement(time::steady_clock::now() - outRecord->getLastRenewed());
NFD_LOG_TRACE("Recording RTT for FaceId: " << inFace.getId()
- << " RTT: " << m_rttStats.getRtt()
- << " SRTT: " << m_rttStats.getSrtt());
+ << " RTT: " << m_rttStats.getRtt() << " SRTT: " << m_rttStats.getSrtt());
}
void
@@ -167,9 +150,10 @@
FaceInfo* info = nullptr;
if (it == m_fit.end()) {
- const auto& pair = m_fit.emplace(faceId, FaceInfo());
+ const auto& pair = m_fit.emplace(std::piecewise_construct,
+ std::forward_as_tuple(faceId),
+ std::forward_as_tuple());
info = &pair.first->second;
-
extendFaceInfoLifetime(*info, faceId);
}
else {
diff --git a/daemon/fw/asf-measurements.hpp b/daemon/fw/asf-measurements.hpp
index a3775b0..0032f14 100644
--- a/daemon/fw/asf-measurements.hpp
+++ b/daemon/fw/asf-measurements.hpp
@@ -26,10 +26,11 @@
#ifndef NFD_DAEMON_FW_ASF_MEASUREMENTS_HPP
#define NFD_DAEMON_FW_ASF_MEASUREMENTS_HPP
-#include "core/rtt-estimator.hpp"
#include "fw/strategy-info.hpp"
#include "table/measurements-accessor.hpp"
+#include <ndn-cxx/util/rtt-estimator.hpp>
+
namespace nfd {
namespace fw {
namespace asf {
@@ -37,12 +38,10 @@
class RttStats
{
public:
- typedef time::duration<double, boost::micro> Rtt;
-
RttStats();
void
- addRttMeasurement(RttEstimator::Duration& durationRtt);
+ addRttMeasurement(time::nanoseconds rtt);
void
recordTimeout()
@@ -50,36 +49,32 @@
m_rtt = RTT_TIMEOUT;
}
- Rtt
+ time::nanoseconds
getRtt() const
{
return m_rtt;
}
- Rtt
+ time::nanoseconds
getSrtt() const
{
return m_srtt;
}
- RttEstimator::Duration
+ time::nanoseconds
computeRto() const
{
- return m_rttEstimator.computeRto();
+ return m_rttEstimator.getEstimatedRto();
}
-private:
- static Rtt
- computeSrtt(Rtt previousSrtt, Rtt currentRtt);
-
public:
- static const Rtt RTT_TIMEOUT;
- static const Rtt RTT_NO_MEASUREMENT;
+ static const time::nanoseconds RTT_TIMEOUT;
+ static const time::nanoseconds RTT_NO_MEASUREMENT;
private:
- Rtt m_srtt;
- Rtt m_rtt;
- RttEstimator m_rttEstimator;
+ time::nanoseconds m_srtt;
+ time::nanoseconds m_rtt;
+ ndn::util::RttEstimator m_rttEstimator;
static const double ALPHA;
};
@@ -142,19 +137,19 @@
return getRtt() == RttStats::RTT_TIMEOUT;
}
- RttEstimator::Duration
+ time::nanoseconds
computeRto() const
{
return m_rttStats.computeRto();
}
- RttStats::Rtt
+ time::nanoseconds
getRtt() const
{
return m_rttStats.getRtt();
}
- RttStats::Rtt
+ time::nanoseconds
getSrtt() const
{
return m_rttStats.getSrtt();
@@ -203,7 +198,7 @@
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
-/** \brief stores stategy information about each face in this namespace
+/** \brief stores strategy information about each face in this namespace
*/
class NamespaceInfo : public StrategyInfo
{
@@ -251,10 +246,12 @@
return m_fit.end();
}
- const FaceInfoTable::iterator
+ FaceInfoTable::iterator
insert(FaceId faceId)
{
- return m_fit.emplace(faceId, FaceInfo()).first;
+ return m_fit.emplace(std::piecewise_construct,
+ std::forward_as_tuple(faceId),
+ std::forward_as_tuple()).first;
}
bool
diff --git a/daemon/fw/asf-strategy.cpp b/daemon/fw/asf-strategy.cpp
index ce689bc..4e26817 100644
--- a/daemon/fw/asf-strategy.cpp
+++ b/daemon/fw/asf-strategy.cpp
@@ -247,7 +247,7 @@
if (!faceInfo.isTimeoutScheduled()) {
// Estimate and schedule timeout
- RttEstimator::Duration timeout = faceInfo.computeRto();
+ auto timeout = faceInfo.computeRto();
NFD_LOG_TRACE("Scheduling timeout for " << fibEntry.getPrefix() << " to: " << egress
<< " in " << time::duration_cast<time::milliseconds>(timeout) << " ms");
@@ -261,27 +261,27 @@
struct FaceStats
{
Face* face;
- RttStats::Rtt rtt;
- RttStats::Rtt srtt;
+ time::nanoseconds rtt;
+ time::nanoseconds srtt;
uint64_t cost;
};
-double
+time::nanoseconds
getValueForSorting(const FaceStats& stats)
{
// These values allow faces with no measurements to be ranked better than timeouts
// srtt < RTT_NO_MEASUREMENT < RTT_TIMEOUT
- static const RttStats::Rtt SORTING_RTT_TIMEOUT = time::microseconds::max();
- static const RttStats::Rtt SORTING_RTT_NO_MEASUREMENT = SORTING_RTT_TIMEOUT / 2;
+ static const time::nanoseconds SORTING_RTT_TIMEOUT = time::nanoseconds::max();
+ static const time::nanoseconds SORTING_RTT_NO_MEASUREMENT = SORTING_RTT_TIMEOUT / 2;
if (stats.rtt == RttStats::RTT_TIMEOUT) {
- return SORTING_RTT_TIMEOUT.count();
+ return SORTING_RTT_TIMEOUT;
}
else if (stats.rtt == RttStats::RTT_NO_MEASUREMENT) {
- return SORTING_RTT_NO_MEASUREMENT.count();
+ return SORTING_RTT_NO_MEASUREMENT;
}
else {
- return stats.srtt.count();
+ return stats.srtt;
}
}
@@ -298,8 +298,8 @@
FaceStatsSet rankedFaces(
[] (const FaceStats& lhs, const FaceStats& rhs) -> bool {
// Sort by RTT and then by cost
- double lhsValue = getValueForSorting(lhs);
- double rhsValue = getValueForSorting(rhs);
+ time::nanoseconds lhsValue = getValueForSorting(lhs);
+ time::nanoseconds rhsValue = getValueForSorting(rhs);
if (lhsValue < rhsValue) {
return true;